<template>
  <div class="article-container">
    <!-- 1. 导航栏 -->
    <van-nav-bar left-arrow title="黑马头条" @click-left="$router.back()"></van-nav-bar>

    <!-- 2. 主体区域 -->
    <div class="main-wrap">
      <!-- 2.1 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 2.2 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="artData.title">
        <h1 class="article-title">{{ artData.title }}</h1>
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="artData.aut_photo"
          />
          <div slot="title" class="user-name">{{ artData.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ artData.pubdate | time }}
          </div>
          <van-button
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            >关注</van-button
          >
        </van-cell>
        <div
          ref="artContent"
          class="article-content markdown-body"
          v-html="artData.content"
        ></div>
        <van-divider>正文结束</van-divider>
      </div>

      <!-- 2.3 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 2.4 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="load">点击重试</van-button>
      </div>
    </div>

    <!-- 3. 底部区域 -->
    <div v-if="artData.title" class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small"
        >写评论</van-button
      >
      <van-icon name="comment-o" color="#777" />
      
      <CollectArt v-model="artData.is_collected" :id="artData.art_id"></CollectArt>
      <LikeArt :value.sync="artData.like_count" :id="artData.art_id"></LikeArt>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
  </div>
</template>

<script>
import LikeArt from '@/components/LikeArt'
import CollectArt from '@/components/collectArt'
import { ImagePreview } from 'vant';
import { requestDetail } from "@/api";
export default {
  name: "ArticleDetail",
  components:{CollectArt,
  LikeArt},
  data() {
    return {
      artData: "",
      loading: true, //是否加载中
      is404: false, //是否404错误
    };
  },
  methods:{
    async load() {
    try {
      this.loading = true
      // 模拟网络异常：
      // if(Math.random()>0.6){
      //   JSON.parse('avf')
      // }
      // 获取网页详情页
      const res = await requestDetail(this.$route.params.id);
      this.artData = res.data;
      setTimeout(()=>{
        this.previewImage()
      })
    } catch (error) {
      console.log('err',error)
      if(error.response && error.response.status == 404){
        console.log('404页面')
        this.is404 = true
      }
    } finally {
      this.loading = false;
    }
  },
  // 预览图片的方法
  previewImage(){
    // 1.获取所有元素的dom节点
    const imgDoms=this.$refs.artContent.querySelectorAll('img')
    const imageUrls=[]
    imgDoms.forEach((img,index)=> {
      imageUrls.push(img.src)
      console.log(imageUrls)
      img.onclick=()=>{
        ImagePreview({
          images:imageUrls,
          startPosition:index
        })
      }
    });
  },
  },
  created(){
    this.load()
  }

};
</script>

<style scoped lang="less">
@import url("./github-markdown.css");
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
